feat: assemble Go scheduler and backend workers

cmd/gitea-dynamic-runner/main.go

@@ -19,12 +19,18 @@ func main() {
 }
 
 func run() error {
-	if len(os.Args) != 2 {
-		return errors.New("usage: gitea-dynamic-runner executor")
+	if len(os.Args) > 2 {
+		return errors.New("usage: gitea-dynamic-runner [controller|executor]")
 	}
 	ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
 	defer stop()
-	switch os.Args[1] {
+	command := "controller"
+	if len(os.Args) == 2 {
+		command = os.Args[1]
+	}
+	switch command {
+	case "controller":
+		return runController(ctx)
 	case "executor":
 		config, err := runnerbootstrap.ExecutorConfigFromEnvironment()
 		if err != nil {
@@ -32,6 +38,6 @@ func run() error {
 		}
 		return runnerbootstrap.RunExecutor(ctx, config)
 	default:
-		return fmt.Errorf("unknown command %q", os.Args[1])
+		return fmt.Errorf("unknown command %q", command)
 	}
 }